If you need to extract the exact source code, it may be quite difficult. If it is sufficient to get a functional equivalent, look into B::Deparse; from the docs:
$deparse = B::Deparse->new("-p", "-sC");
$body = $deparse->coderef2text(\&func);
and here's a specific example as a one-liner:
zen% perl -MB::Deparse -MCarp -wle 'print B::Deparse->new("-p","-sC"
See the rest of the docs for full details of the options available.
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